alex@darknet:~/C$ time ./sieve
 ::::::::::: Eratostene's Sieve :::::::::::
THE 4-th prime number before 10 are :
 1)     2
2)      3
3)      5
4)      7

real    0m0.003s
user    0m0.000s
sys     0m0.000s

alex@darknet:~/C$ time ./dani
2
3
5
7
numeri primi inferiori di 10

real    0m0.003s
user    0m0.000s
sys     0m0.000s